Komunikasi LORA RA-02 menggunakan ESP8266 (Lora Gateway) dengan Display LCD OLED

================================== SOURCE CODE ==================================
#include "SPI.h"
#include "SPI.h"
#include "LoRa.h"
#include "Wire.h"
#include "Adafruit_GFX.h"
#include "Adafruit_SSD1306.h"

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     LED_BUILTIN // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define ss 15
#define rst 16
#define dio0 2
int counter = 0;


void setup() {
  Serial.begin(115200);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  while (!Serial);
  Serial.println("LoRa Sender");
  LoRa.setPins(ss, rst, dio0);
    if (!LoRa.begin(473E6)) {
    Serial.println("Starting LoRa failed!");
    delay(100);
    while (1);
  }
  
  display.display();
  delay(2);
  display.clearDisplay();
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);

  display.clearDisplay();
  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(WHITE);        // Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("LoRa Tx"));
  display.setCursor(0,20); 
  display.print("Pkt No:");
  display.print(counter);
  display.display();
  
  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;

  delay(1000);
}

================================== SOURCE CODE ==================================
#include "SPI.h"
#include "SPI.h"
#include "LoRa.h"

#define ss 15
#define rst 16
#define dio0 2

void setup() {
  Serial.begin(115200);
  while (!Serial);

  Serial.println("LoRa Receiver Callback");

  LoRa.setPins(ss, rst, dio0);

  if (!LoRa.begin(473E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  // register the receive callback
  LoRa.onReceive(onReceive);

  // put the radio into receive mode
  LoRa.receive();
}

void loop() {
  // do nothing
}

void onReceive(int packetSize) {
  // received a packet
  Serial.print("Received packet '");

  // read packet
  for (int i = 0; i < packetSize; i++) {
    Serial.print((char)LoRa.read());
  }

  // print RSSI of packet
  Serial.print("' with RSSI ");
  Serial.println(LoRa.packetRssi());
}